My Father Walked Into The Hospital With Stomach Pain, Shortly

my father walked into the hospital with stomach pain, shortly after he was given a dose of fentanyl shortly after he was put on a respirator to help him breath. The only thing they found through testing was high white cell count. Three days later his liver was enlarged and was in renal failure all the while on fentanyl IV. He had a history of COPD, could the fentanyl have caused all these problems?